and how do I get more of it

Pretty sure it is for the drilling, higher for more resources (?)

It seemed to be steadily raising, maybe by having them on your drilling team? 

Mostly speculation but that's what I have gathered so far

(i'm bad at english)it makes sex faster when i was playing release 5. I'm not sure if it has the same effect now. get stars with any positions to gain tech.

In older version you can purchase them as upgrade, higher mean faster heart gain (not sure how to put it really).

Nvm it seem they changed it.